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| Registros recuperados: 13 | |
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| Barbarack, K.A.; Ippolito, J.A.; McDaniel, J.P.; Hansen., N.C.; Peterson, G.A.. |
| In the western Great Plains, climate dictates dryland wheat (Triticum aestivum, L) productivity. Producers use inorganic N fertilizers to improve crop yields in this region, while municipalities recycle sewage biosolids in the area. Will biosolids (from the Littleton/Englewood, CO Wastewater Treatment Plant) applications to western Great Plains dryland agroecosystems interact with weather to affect wheat production? To this end, we regressed crop yields on weather variables from 2000 through 2011 at a site about 40 km (approximately 25 miles) east of Byers, CO (Byers). We used SAS (Proc Reg) to develop several multiple regression models to predict crop yields. Our model of choice included four weather parameters for Byers wheat production. Regression... |
| Tipo: Technical Bulletin |
Palavras-chave: Dryland crops; Fertilizer; Nitrogen. |
| Ano: 2013 |
URL: http://eprints.nwisrl.ars.usda.gov/1515/1/1479.pdf |
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| Barbarack, K.A.; Ippolito, J.A.; McDaniel, J.. |
| Biosolids regulations developed in the United States employed risk assessment impacts of trace element additions on plant uptake. The US Environmental Protection Agency adapted the uptake coefficient (ratio of plant concentration to quantity of element added) when developing limitations on selected elemental additions. The nature of the risk assessment requires uptake coefficients to be constants. Our hypothesis was the uptake coefficient for copper, iron, molybdenum, nickel, phosphorus, and zinc for biosolids-amended dryland winter wheat decreases with multiple biosolids applications at the same location. We applied up to 10 applications to two sites (designated North Bennett A and B) in eastern Colorado at rates from 2.24 to 11.2 megagrams per... |
| Tipo: Article |
Palavras-chave: Dryland crops; Research methodology; Soil. |
| Ano: 2015 |
URL: http://eprints.nwisrl.ars.usda.gov/1580/1/1536.pdf |
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| Freeman, C.L.; Ippolito, J.A.; Stromberger, M.E.; Barbarack, K.A.; Redente, E.F.. |
| This study was conducted to determine the effect of biosolids and lime on reclamation of a heavily contaminated metal site. Within the Superfund area near Leadville, CO, biosolids and lime were amended (1998) to a 1 ha site at rates of 240 Mg per ha each. In 2006, soil samples were collected on a 10 m x 10 m grid to a depth of 30 cm across the site. Basic soil analysis included pH, EC, total C and N, inorganic and organic C, and NO3-N and NH4-N. A sequential fractionation for metal contaminants of concern (Cd, Cr, Fe, Pb, Mn, and Zn) identified associations with: 1) soluble/exchangeable; 2) specifically sorbed/weakly bound; 3) non-crystalline Fe/Mn oxides; 4) crystalline Fe/Mn oxides and organically complexed; 5) residual organic; and 6) residual... |
| Tipo: Conference or Workshop Item |
Palavras-chave: Soil. |
| Ano: 2008 |
URL: http://eprints.nwisrl.ars.usda.gov/1433/1/1346.pdf |
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| Barbarack, K.A.; Ippolito, J.A.. |
| Biosolids Beneficial Use Programs frequently involve multiple applications at agronomic rates, with plant-nutrient availability changing as elements react with soil constituents over time. Consequently, can regression equations reasonably estimate plant availability of Zn, P, Fe, and Cu, where multiple applications of Littleton and Englewood, Colorado Wastewater Treatment Plant biosolids are applied to a dryland wheat (Triticum aestivum L.)-fallow agroecosystem? Before each growing season, we added Littleton and Englewood biosolids at rates of 0 to 11.2 dry Mg ha?1 to plots arranged in randomized complete blocks with four replications per treatment. Soil samples collected after each wheat harvest were analyzed using an NH4HCO3-diethylenetriaminepentaacetic... |
| Tipo: Article |
Palavras-chave: Manure; Fertilizer; Soil quality. |
| Ano: 2008 |
URL: http://eprints.nwisrl.ars.usda.gov/1269/1/1245.pdf |
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| Bayley, R.M.; Ippolito, J.A.; Stromberger, M.E.; Barbarack, K.A.; Paschke, M.W.. |
| Land coapplication of water treatment residuals (WTR) with biosolids has not been extensively researched, but the limited studies performed suggest that WTR sorb excess biosolids-borne P. To understand the long-term effects of a single coapplication and the short-term impacts of a repeated coapplication on soil P inorganic and organic transformations, 7.5- by 15-m plots with treatments of three different WTR rates with a single biosolids rate (5, 10, and 21 Mg WTR ha-1 and 10 Mg biosolids ha-1) surface coapplied once in 1991 or surface reapplied in 2002 were utilized. Soils from the 0- to 5-cm depth were collected in 2003 and 2004 and were sequentially fractionated for inorganic and organic P (Po). Inorganic P fractionation determined (i) soluble and... |
| Tipo: Article |
Palavras-chave: Phosphorous. |
| Ano: 2008 |
URL: http://eprints.nwisrl.ars.usda.gov/1271/1/1248.pdf |
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| Registros recuperados: 13 | |
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